Is the “Contains” Delphi string helper case sensitive?

问题

Delphi XE3 introduced a Contains string helper function, but the help-file/wiki does not state whether it is case sensitive or not?

回答1:

Yes it is case sensitive.

Quick test:

ShowMessage('TEST'.Contains('t').ToString(TUseBoolStrs.True));

returns False

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Use ToLowerInvariant or ToUpperInvariant to compare case insensitive:

ShowMessage('TEST'.ToLowerInvariant.Contains('t').ToString(TUseBoolStrs.True));

来源：https://stackoverflow.com/questions/30180634/is-the-contains-delphi-string-helper-case-sensitive